diff --git a/implementations/javascript/packages/schema/test/reader.test.ts b/implementations/javascript/packages/schema/test/reader.test.ts
index 4d5d55d..adb13da 100644
--- a/implementations/javascript/packages/schema/test/reader.test.ts
+++ b/implementations/javascript/packages/schema/test/reader.test.ts
@@ -9,7 +9,7 @@ describe('reader schema', () => {
     });
     it('is OK with an empty schema correctly versioned', () => {
         const s = readSchema('version 1 .');
-        expect(s.version).toBeNull();
+        expect(Object.getOwnPropertyNames(s.version)).toEqual(['__as_preserve__']);
         expect(s.definitions.size).toBe(0);
         expect(s.embeddedType._variant).toBe('false');
     });